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Note 9 - Stockholders' Equity (Details Textual)
3 Months Ended
Jan. 24, 2020
USD ($)
$ / shares
shares
Jan. 21, 2020
Apr. 30, 2019
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
$ / shares
shares
Preferred Stock, Shares Authorized (in shares)       10,000,000   10,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares       $ 0.01   $ 0.01
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       400   2,486
Stock Issued During Period, Shares, Issued for Services (in shares)       10,417    
Stock Issued During Period, Value, Issued for Services | $       $ 6,000    
Conversion of Stock, Shares Converted | $       0    
Stock Issued During Period, Value Expensed During the Period, Issued for Services | $       6,000 $ 126,572  
Share-based Payment Arrangement, Option [Member]            
Share-based Payment Arrangement, Expense | $       $ 0 $ 26,652  
Reverse Stock Split [Member]            
Stockholders' Equity Note, Stock Split, Conversion Ratio   2,000 500      
Conversion of Series H Preferred Stock Into Common Stock [Member]            
Conversion of Stock, Shares Converted (in shares)       1,686    
Conversion of Stock, Shares Issued (in shares)       9,393,937    
Conversion of Series I Preferred Stock Into Common Stock [Member]            
Conversion of Stock, Shares Converted (in shares)       700    
Conversion of Stock, Shares Issued (in shares)       4,087,412    
Conversion of Series H and Series I Preferred Stock Into Common Stock [Member]            
Conversion of Stock, Shares Issued (in shares)       13,481,349    
Series B Convertible Preferred Stock [Member]            
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares       $ 1,000    
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       100   100
Convertible Preferred Stock, Conversion Price1 (in dollars per share) | $ / shares       $ 350,000    
Series H Convertible Preferred Stock [Member]            
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       0   1,686
Series I Convertible Preferred Stock [Member]            
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       0   700
Series J Convertible Preferred Stock [Member]            
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       300  
Convertible Preferred Stock, Conversion Price1 (in dollars per share) | $ / shares $ 2          
Stock Issued During Period, Shares, New Issues (in shares) 300          
Proceeds from Issuance of Preferred Stock and Preference Stock | $ $ 300,000